What plus 38 equals 78?

This is how to calculate "What plus 38 equals 78?" In other words, what do you add to 38 to get 78? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 38 = 78

To solve this equation, we first add -38 to each side of the equal sign like this:

What + 38 - 38 = 78 - 38

Then, we do the calculation to get the answer to "What plus 38 equals 78?" as follows:

What = 40

The answer to "What plus 38 equals 78?" is 40. You know this answer is correct because 40 plus 38 equals 78.

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What plus 38 equals 79?
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